how to test communication relay with multimeter： a step-by-step guide
Release time:2025-08-09 19:11:48
Testing a communication relay with a multimeter is an essential skill for troubleshooting and ensuring the proper operation of electronic circuits. Relays are used in various applications, including communication systems, to switch electrical signals and control the flow of current. By using a multimeter, you can verify the health of the relay’s components and ensure that it functions as intended. This article provides a step-by-step guide on how to test a communication relay with a multimeter.
Understanding Communication Relays
A communication relay typically has a coil and multiple contacts. The coil is responsible for switching the relay’s contacts between two states： normally open (NO) and normally closed (NC). The common (COM) pin connects to either the NO or NC contact, depending on whether the relay is energized or de-energized. The purpose of the relay is to open or close the circuit, allowing it to control the flow of electrical signals in communication systems or other electronic devices.
Before testing the relay, it’s important to understand the basic components and their function：
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